document.write( "Question 1039661: Find the 1st element of an arithmetic sequence whose 18th term is 20 and whose common difference is -2. \n" ); document.write( "

Algebra.Com's Answer #654407 by ikleyn(52788) $\"\"$ $\"About$

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\n" ); document.write( "On arithmetic progressions see the lessons\r
\n" ); document.write( "\n" ); document.write( "    Arithmetic progressions\r
\n" ); document.write( "\n" ); document.write( "    The proofs of the formulas for arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    Problems on arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "    Word problems on arithmetic progressions \r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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